Iphone 6 Wi-Fi problem?

I'm starting to get a little pissed. I've had my iphone 6 for 2 years now and it always worked fine, but within the past month its suddenly started to have a lot of problems. First it stopped recognizing the charger and then yesterday it wouldn't turn on at all so I had to leave it off for 5 hours and then try to charge it again. And then today i woke up and the internet doesn't work at all. Its connected to my router and the router is working, so its definitely a problem with the phone. Even when I left my house with my phone and it switched to the LTE, I still couldn't use the internet. Usually the box for vpn pops up next to the Wi-Fi signal and that lets me know if the internet is working but it hasn't shown up at all today. What should I do? I've tried everything in this youtube video and nothing worked.

I can't update my phone to ios 10 because when I connect it to my computer, itunes says that I don't have enough space on my phone. The update takes 700 mb and I only have 350 mb to spare

You need to replace the phone's charger hole and replace the antenna.

When the phone doesn't recognize the charger it could one one of three things: - you are using a non apple cable 2- your cable is busted or 3- the phone's charger inlet needs replacement.

A lot of the internet issues are fixed with software updates. Use iCloud to back up your pictures and delete unnecessary apps and content to free up space for the iOS update. Do this from settings, storage, manage storage and it will lust the apps and how much space they are using.

Iphones only have a life of about 3 years, I've had my 5s for 2 and a half years now and it's slow, crashes often and sometimes doesn't connect to Wi-Fi. The charging problem happens with mine as well. Try cleaning the charging port out for lint. Clear out some storage. Go delete any apps you don't use, and any videos you don't need. They eat up a lot of space. About the Wi-Fi, I tried everything and the only thing that worked was turning my phone off and leaving it overnight. Resetting the phone sometimes works (hold down the power button and home button until it the apple logo shows), if you use any vpns or vpn apps delete them and then try to connect to Wi-Fi. It could also be the router. Maybe you should get it looked at? Honestly, iphones don't last long. It's apples way of getting you to constantly upgrade and spend more money. If you haven't finished paying it off, maybe you could get a replacement? But that's only if literally nothing else works and you really need a new phone.